Home : Tune Toys : Expresso 
  Expresso takes a simple musical expression (literally "X") and mutates it. In each generation, transformations are applied to components of the expression. This is a fractal technique known as an L-system. The more generations there are, the larger and more complex the expression gets (and the longer it can take to compute). The output varies wildly, from boring to fascinating. Press "Mutate" a few times till you get something that looks interesting, then click on the image to play it. See Composer's Quarry for examples of output.

Transformations:
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After 19 generations the expression "X" became this:
((shuffle((transpose(transpose((shuffle(((transpose(transpose(transpose(((step(((X|X) |(X+X) ) ,12) +transpose(arpeggio(shuffle(X) ) ,7) ) |step(transpose(transpose(transpose(X,-5) ,-5) ,4) ,12) ) ,-7) ,-7) ,4) +transpose((step(transpose(X,-5) ,12) +transpose(transpose((X+X) ,4) ,12) ) ,4) ) +transpose(transpose(echo(transpose(arpeggio(transpose(X,4) ) ,-7) ,4,6) ,-5) ,7) ) ) +transpose(transpose((((transpose(transpose((echo(X,4,6) +transpose(transpose((X+transpose(X,7) ) ,4) ,7) ) ,-5) ,4) +transpose((((X|X) |step(X,12) ) +(X+transpose(X,12) ) ) ,7) ) +transpose(((echo(arpeggio(step(X,12) ) ,4,6) +transpose((transpose(X,4) +transpose(transpose(arpeggio((X+transpose(X,7) ) ) ,4) ,12) ) ,7) ) +transpose((transpose(transpose((X+X) ,4) ,-5) +transpose((((echo(X,4,6) |(X+transpose(X,12) ) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose(transpose(X,4) ,-5) ,7) ) ,12) ) ,12) ) ,-7) ) +transpose((((transpose((X+X) ,4) +transpose(transpose(transpose(X,4) ,-5) ,-5) ) +(arpeggio(X) +transpose(transpose(X,-5) ,12) ) ) +transpose(step((((transpose((X+transpose(X,7) ) ,4) +(X|transpose(X,4) ) ) |(transpose(((transpose(X,-7) +transpose(transpose(X,-7) ,4) ) +transpose(shuffle((X|X) ) ,7) ) ,-7) +(((X+transpose(X,4) ) +transpose(X,7) ) +(X+transpose(X,12) ) ) ) ) |((transpose(transpose(X,4) ,4) |((echo(X,4,6) +transpose(transpose(X,-7) ,7) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +(X+X) ) ,12) ) ) |arpeggio((transpose(X,-5) +X) ) ) ) ,12) ,7) ) ,7) ) ,-7) ,7) ) ,4) ,4) +step((transpose(transpose(transpose(transpose(transpose(echo(shuffle((transpose(X,4) +(X+X) ) ) ,4,6) ,4) ,-7) ,-5) ,4) ,4) +transpose(transpose(((((X+transpose(transpose(transpose(X,4) ,4) ,12) ) +transpose((transpose(transpose(X,-7) ,-5) +transpose(transpose(((X+transpose(X,12) ) +transpose((X+X) ,7) ) ,-7) ,7) ) ,12) ) +transpose(transpose(((transpose((step((X|X) ,12) |shuffle(echo(X,4,6) ) ) ,-7) +transpose((transpose(((X+transpose(X,12) ) |(X+X) ) ,4) +((transpose(X,-7) +transpose((step((X|X) ,12) +(transpose(X,4) +X) ) ,12) ) +shuffle(transpose(X,-5) ) ) ) ,4) ) +transpose(((((((transpose(X,4) +transpose(X,12) ) |shuffle(X) ) +transpose(arpeggio(X) ,4) ) +transpose(transpose(X,-7) ,7) ) +transpose((transpose(X,4) +transpose(shuffle(X) ,7) ) ,7) ) +transpose(transpose(((X+transpose(arpeggio(X) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ,4) ) ,7) ) ,-5) ,4) ) +transpose(((step(transpose((transpose(echo(X,4,6) ,-7) +transpose(X,12) ) ,4) ,12) +transpose(step((echo(transpose((((X+transpose(X,7) ) +transpose(transpose(shuffle(X) ,4) ,4) ) +transpose(shuffle(X) ,7) ) ,4) ,4,6) +transpose(step(X,12) ,-7) ) ,12) ,7) ) +(((transpose(transpose((shuffle(X) +transpose((transpose(X,-5) +transpose((X+X) ,7) ) ,12) ) ,4) ,-7) +transpose(echo(shuffle(((X|X) +transpose(X,12) ) ) ,4,6) ,4) ) +transpose((((((X+transpose(transpose(X,4) ,7) ) +X) +transpose(((transpose(transpose(X,4) ,-5) +transpose(((X+transpose(X,4) ) +transpose((X|X) ,7) ) ,12) ) |shuffle(arpeggio(X) ) ) ,4) ) +transpose(transpose(transpose(X,-5) ,-5) ,7) ) +transpose(arpeggio((transpose(X,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ) ,4) ) ,7) ) |transpose(((shuffle((((X+transpose(X,4) ) +transpose((X+transpose(X,12) ) ,7) ) +((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,4) ) +transpose(X,7) ) ) ) +transpose(((X+transpose(X,7) ) |((((X|X) +transpose(transpose(X,4) ,12) ) +X) +transpose((X|((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ) ) ,4) ) +transpose(transpose(step(X,12) ,4) ,7) ) ,-7) ) ) ,7) ) ,4) ,12) ) ,12) ) ) +transpose(((transpose(((((transpose(transpose(transpose(transpose(echo(shuffle((((X+X) |(X+transpose(X,7) ) ) |transpose(transpose(X,4) ,-5) ) ) ,4,6) ,-5) ,-5) ,-5) ,-5) +transpose((transpose(((shuffle(((((X|X) +transpose(transpose((X+X) ,-7) ,4) ) +transpose(arpeggio((X+X) ) ,7) ) |transpose(arpeggio((transpose(X,4) +X) ) ,-7) ) ) +transpose((((arpeggio(step((X+X) ,12) ) +transpose((((X+X) +X) +transpose(echo(X,4,6) ,4) ) ,7) ) +transpose(((transpose(transpose(shuffle(((echo(transpose(X,-7) ,4,6) +transpose((transpose(transpose(X,4) ,-7) |transpose(X,4) ) ,4) ) +transpose((X+X) ,7) ) ) ,-7) ,4) +transpose((((X|X) +(X+transpose(X,12) ) ) +transpose((((((step(X,12) +transpose(arpeggio(X) ,4) ) +transpose(X,7) ) +transpose(transpose(step(X,12) ,-5) ,4) ) +transpose(transpose(X,-7) ,7) ) +(((X+transpose(X,7) ) |(X+X) ) +transpose((X+transpose(transpose(X,4) ,12) ) ,7) ) ) ,7) ) ,4) ) +transpose((echo((transpose(X,4) |transpose(transpose(X,-7) ,-5) ) ,4,6) +transpose(transpose(transpose(((arpeggio((X|X) ) |transpose(transpose(X,-5) ,-5) ) |(X+X) ) ,4) ,4) ,7) ) ,7) ) ,4) ) +transpose(transpose(echo(((transpose(transpose(X,4) ,4) +(((X+transpose(X,7) ) +transpose(transpose(X,-7) ,4) ) +transpose(arpeggio(X) ,7) ) ) |transpose(((echo(X,4,6) +transpose(arpeggio(X) ,12) ) +transpose(X,-5) ) ,4) ) ,4,6) ,4) ,7) ) ,4) ) +transpose(((shuffle(transpose(X,-5) ) +transpose(shuffle(transpose((transpose(X,-7) |echo(X,4,6) ) ,4) ) ,-7) ) +transpose(transpose(transpose(echo(transpose(X,4) ,4,6) ,4) ,4) ,12) ) ,7) ) ,-7) +transpose(step(transpose(transpose((step((((((X+X) +transpose((X+transpose(X,7) ) ,4) ) +transpose(X,7) ) +transpose(transpose(shuffle(X) ,4) ,4) ) +transpose(echo(shuffle(X) ,4,6) ,7) ) ,12) +(((transpose(X,4) +transpose(((transpose(X,-5) +X) +X) ,4) ) +transpose((arpeggio(transpose(X,-5) ) +arpeggio((X+transpose(X,7) ) ) ) ,7) ) |(((transpose(shuffle(X) ,-7) +(X+X) ) +transpose(transpose(transpose((X+transpose(X,12) ) ,4) ,-5) ,12) ) +transpose(((X+transpose(X,7) ) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,7) ) ,-7) ) ) ) ,-7) ,-7) ,12) ,-5) ) ,4) ) +transpose(((transpose((transpose(transpose(transpose(transpose(((X+transpose(X,12) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,-5) ,-7) ,4) ,-7) |transpose(transpose(((echo(arpeggio(X) ,4,6) +(X+X) ) +transpose(((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ,-7) ) ,4) ,-7) ) ,-5) +arpeggio(((transpose((transpose(arpeggio(X) ,-7) +transpose(X,4) ) ,4) +transpose((transpose(transpose(X,-7) ,4) +transpose(transpose(X,4) ,7) ) ,12) ) +transpose((transpose((((X+((X+transpose(X,7) ) +transpose(transpose(X,-7) ,7) ) ) +transpose((arpeggio(X) +(X+transpose((X+X) ,7) ) ) ,4) ) +transpose(X,7) ) ,-7) +transpose((((transpose(X,4) +transpose(transpose(((X+transpose(X,-7) ) +transpose((X+X) ,12) ) ,-5) ,12) ) +transpose(((transpose(X,4) |X) +shuffle(transpose(X,-5) ) ) ,4) ) +transpose((((X|X) |((X+transpose(X,12) ) +transpose(X,4) ) ) +((transpose((X+X) ,-5) |X) +(transpose(X,-5) +((X+transpose(X,4) ) +transpose(X,7) ) ) ) ) ,7) ) ,12) ) ,12) ) ) ) +transpose(transpose(((echo(transpose(transpose(X,-5) ,-5) ,4,6) +transpose(X,4) ) +transpose((transpose(X,-7) +(step(X,12) +X) ) ,7) ) ,4) ,-7) ) ,7) ) +transpose(((transpose(shuffle(((((transpose((echo(transpose(transpose((X+X) ,4) ,4) ,4,6) +transpose((transpose((((X+transpose(X,7) ) +transpose(transpose(shuffle(X) ,4) ,4) ) +transpose((transpose(X,4) +transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ) ,7) ) ,-7) |transpose(step(X,12) ,4) ) ,12) ) ,-7) +arpeggio(transpose(((X+transpose(X,7) ) +transpose(arpeggio(X) ,7) ) ,4) ) ) |transpose(echo((shuffle((X+X) ) +(transpose(X,-5) |X) ) ,4,6) ,-5) ) +transpose(((shuffle((step(echo(X,4,6) ,12) +transpose(step((((((X+transpose(X,7) ) |echo(X,4,6) ) +transpose(X,12) ) +transpose((arpeggio((X+transpose(X,7) ) ) |(X+transpose(X,12) ) ) ,4) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ,7) ) ,12) ,12) ) ) +transpose(transpose((arpeggio((transpose((transpose((X+X) ,-7) +transpose(((X+transpose(X,12) ) |transpose(X,-5) ) ,7) ) ,-5) +transpose((transpose(step(X,12) ,-5) +transpose(transpose(X,4) ,7) ) ,12) ) ) +transpose(step((((((X+transpose(X,12) ) +(X+X) ) |((X+transpose(X,4) ) +transpose(X,7) ) ) +transpose(step(((X+X) +X) ,12) ,7) ) +((X+transpose(X,4) ) +transpose(X,7) ) ) ,12) ,12) ) ,-5) ,4) ) +transpose(transpose((transpose((X+transpose(echo(X,4,6) ,-7) ) ,-7) +transpose(((X+X) +(X|X) ) ,7) ) ,4) ,7) ) ,7) ) |transpose(arpeggio(transpose(echo(echo((X|X) ,4,6) ,4,6) ,-7) ) ,-5) ) ) ,-7) +transpose((transpose(((((step((X+X) ,12) +transpose((transpose((X+X) ,-5) +transpose((arpeggio(X) +transpose(transpose(X,-5) ,7) ) ,7) ) ,7) ) +echo(X,4,6) ) +transpose((transpose((X+transpose(X,4) ) ,-5) +transpose(echo((X|arpeggio(X) ) ,4,6) ,7) ) ,12) ) +transpose((transpose(((transpose((transpose(shuffle(shuffle(X) ) ,4) +transpose((arpeggio((X+X) ) +(X|X) ) ,12) ) ,-5) +transpose(((transpose(echo(X,4,6) ,-7) +transpose(echo((X+X) ,4,6) ,4) ) +transpose((((echo(transpose(X,4) ,4,6) |(X|X) ) +transpose((((X+transpose(X,4) ) +transpose(X,7) ) +(X|X) ) ,4) ) +transpose(transpose(X,-5) ,7) ) ,7) ) ,4) ) +transpose(shuffle(shuffle(arpeggio(X) ) ) ,7) ) ,-5) +(echo(((transpose(X,-5) +transpose((transpose(X,-5) +transpose(X,-7) ) ,4) ) +transpose(transpose(step(X,12) ,-5) ,12) ) ,4,6) |arpeggio((transpose((arpeggio(X) +transpose(step(X,12) ,12) ) ,4) |((X|X) +transpose(((echo(X,4,6) +transpose(X,4) ) +transpose(transpose(X,4) ,7) ) ,12) ) ) ) ) ) ,12) ) ,-7) +transpose((transpose(echo(transpose((X|step(X,12) ) ,4) ,4,6) ,-7) +transpose((((echo(((X+transpose(X,4) ) +transpose(X,7) ) ,4,6) |(X+X) ) +transpose(shuffle(((transpose(transpose(X,-7) ,4) +transpose(echo(X,4,6) ,4) ) +transpose(shuffle(X) ,7) ) ) ,4) ) +transpose(((transpose(X,-7) +transpose(echo(X,4,6) ,12) ) +transpose(transpose(X,4) ,7) ) ,7) ) ,7) ) ,12) ) ,4) ) +transpose((echo(transpose(arpeggio((((((X+transpose(X,-5) ) +((X+transpose(step(transpose(X,-5) ,12) ,4) ) +transpose(X,7) ) ) |((((X|X) |transpose(X,-7) ) +transpose(transpose(echo(X,4,6) ,4) ,12) ) |transpose(transpose(X,-5) ,-7) ) ) +transpose(transpose(echo(X,4,6) ,-7) ,7) ) +step((((X+transpose(X,7) ) +(X+transpose(X,7) ) ) |X) ,12) ) ) ,-7) ,4,6) +transpose(transpose(shuffle((transpose((((echo((((X+transpose(X,12) ) +transpose(X,4) ) +transpose(X,7) ) ,4,6) +transpose((transpose(X,-5) +transpose((X+X) ,12) ) ,4) ) +transpose(((echo(transpose(X,-7) ,4,6) |(X+(X+X) ) ) |(transpose((X+transpose(X,7) ) ,4) +transpose(transpose(X,-5) ,7) ) ) ,7) ) +transpose(transpose((echo(X,4,6) |(X+transpose(X,7) ) ) ,4) ,4) ) ,4) |((((transpose(transpose((X|X) ,-7) ,4) |arpeggio(step(transpose(X,-7) ,12) ) ) |transpose(step(((X+transpose(X,4) ) +transpose(X,7) ) ,12) ,-7) ) +transpose(transpose((step(X,12) +transpose((X+X) ,7) ) ,-7) ,12) ) +transpose((transpose((echo(X,4,6) +transpose((X|X) ,7) ) ,4) +transpose(transpose(echo(((transpose(X,-5) +transpose((X|X) ,4) ) +transpose((X+X) ,7) ) ,4,6) ,-5) ,7) ) ,12) ) ) ) ,-5) ,12) ) ,7) ) ,4) ) +transpose(((transpose((arpeggio((transpose(shuffle(step(X,12) ) ,-7) +transpose(transpose(((X+transpose(X,12) ) +transpose(((transpose((X+X) ,4) +transpose(X,-5) ) |transpose(X,-5) ) ,12) ) ,4) ,12) ) ) +transpose(echo((transpose(transpose(X,-7) ,-5) |X) ,4,6) ,12) ) ,4) +transpose((((((transpose(transpose(X,4) ,4) |((transpose(X,-5) +transpose((X|X) ,7) ) +X) ) |(transpose(X,-7) |shuffle(X) ) ) |shuffle((step(shuffle(echo(X,4,6) ) ,12) |arpeggio((X+X) ) ) ) ) |step((transpose(transpose((X+X) ,-7) ,-5) +transpose((((X+X) +transpose(X,-7) ) +transpose((transpose((shuffle(transpose(X,4) ) +transpose(X,4) ) ,-5) +echo(((X|X) |transpose(X,-5) ) ,4,6) ) ,7) ) ,12) ) ,12) ) +transpose((((echo(transpose(X,-7) ,4,6) +(transpose(transpose(X,-7) ,4) +(X|transpose(arpeggio(X) ,-5) ) ) ) +transpose(transpose(step((X|X) ,12) ,-5) ,12) ) |echo(transpose(echo(X,4,6) ,-7) ,4,6) ) ,12) ) ,7) ) +transpose(transpose(((echo(transpose(step(arpeggio(step(X,12) ) ,12) ,-5) ,4,6) +transpose(((((((transpose(X,-7) +transpose((X+transpose(X,7) ) ,4) ) +transpose(transpose((X+transpose(X,7) ) ,-7) ,7) ) +transpose((transpose((X+X) ,-7) +((X+transpose(X,4) ) +transpose(step(X,12) ,7) ) ) ,7) ) +(transpose(transpose(X,4) ,-7) +transpose((X+X) ,7) ) ) +transpose(((((transpose(X,-7) +transpose(echo(X,4,6) ,4) ) +transpose((X+X) ,7) ) +step(X,12) ) +transpose(((X+transpose(X,12) ) |X) ,7) ) ,4) ) +transpose((transpose(step(X,12) ,4) +arpeggio(transpose(transpose(X,4) ,4) ) ) ,7) ) ,4) ) +transpose(step(((((X+transpose(X,7) ) +transpose(transpose(step((transpose(X,4) +(X+transpose(X,12) ) ) ,12) ,-7) ,4) ) +transpose(echo(step((X|X) ,12) ,4,6) ,7) ) |transpose(((transpose(X,-7) +transpose((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) +(transpose(transpose(X,-5) ,4) +transpose(arpeggio(echo(X,4,6) ) ,7) ) ) ,7) ) |transpose((((echo((X+transpose(X,12) ) ,4,6) +transpose(transpose((X+X) ,-7) ,4) ) +transpose(echo(X,4,6) ,7) ) |(transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,4) |((X+transpose(X,7) ) +transpose(transpose(X,4) ,7) ) ) ) ,-7) ) ,4) ) ,12) ,7) ) ,-7) ,-5) ) ,7) ) ,-7) +((step(transpose(transpose((transpose((shuffle((X|X) ) |transpose(X,4) ) ,-7) +transpose((step((X+X) ,12) +transpose(shuffle((((X+X) +transpose(X,4) ) +transpose((X+X) ,7) ) ) ,12) ) ,12) ) ,-5) ,4) ,12) +transpose(echo(transpose((arpeggio(transpose((echo(((X|X) +transpose(transpose(arpeggio(X) ,-5) ,12) ) ,4,6) +transpose(echo(echo(((X+transpose(X,4) ) +transpose((X|X) ,7) ) ,4,6) ,4,6) ,7) ) ,-5) ) |arpeggio(transpose(arpeggio((shuffle((((X|(X+X) ) +transpose(transpose(X,-7) ,4) ) +transpose(arpeggio(transpose(X,4) ) ,7) ) ) +(transpose(((step(transpose(X,-7) ,12) +transpose(transpose(X,-7) ,4) ) +transpose((transpose(X,-7) +transpose(X,7) ) ,7) ) ,-5) +transpose((transpose(X,4) +transpose((transpose(X,-5) +transpose(transpose(X,-7) ,12) ) ,7) ) ,12) ) ) ) ,-5) ) ) ,-5) ,4,6) ,-5) ) |(transpose((transpose((transpose((X|X) ,4) |transpose(echo((X+transpose(X,12) ) ,4,6) ,-7) ) ,4) +(echo(echo(X,4,6) ,4,6) |(transpose(X,4) +transpose(X,-5) ) ) ) ,-5) +transpose((transpose((transpose(arpeggio(transpose(X,4) ) ,-5) +step(transpose(X,4) ,12) ) ,4) +transpose((((((step(echo(X,4,6) ,12) +transpose((shuffle(X) |transpose(X,-5) ) ,4) ) +transpose((transpose(X,-7) |X) ,7) ) +transpose((((transpose(((X+transpose(X,4) ) +transpose(X,7) ) ,-7) +shuffle(X) ) +transpose(transpose(transpose((X+transpose(X,12) ) ,-5) ,4) ,4) ) +transpose(((X+(X+transpose(X,7) ) ) +transpose((X|X) ,-7) ) ,7) ) ,7) ) +transpose((echo((X|(X|X) ) ,4,6) +transpose((step((((X+arpeggio(X) ) +transpose(transpose(X,4) ,4) ) +transpose(transpose(transpose(X,4) ,-7) ,7) ) ,12) +transpose(transpose(step(shuffle(X) ,12) ,-5) ,7) ) ,12) ) ,7) ) +transpose(((transpose(step(X,12) ,4) +transpose(transpose(X,4) ,12) ) +arpeggio((X+transpose(X,7) ) ) ) ,12) ) ,7) ) ,12) ) ) ) +transpose(transpose(transpose((transpose(shuffle((((((((X+X) +transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) |((X+transpose(X,4) ) +transpose((X+transpose(X,7) ) ,7) ) ) +transpose((X+transpose(X,7) ) ,7) ) +transpose(echo((step(echo((arpeggio(X) +step(X,12) ) ,4,6) ,12) |transpose(transpose(X,-5) ,4) ) ,4,6) ,4) ) +transpose(transpose((echo(X,4,6) +transpose(transpose(X,-5) ,4) ) ,-5) ,7) ) ) ,4) +transpose((echo(transpose(transpose((transpose(step(transpose(((X+X) +X) ,-5) ,12) ,-7) +transpose(echo(((X+transpose((X|X) ,4) ) +transpose(X,7) ) ,4,6) ,-7) ) ,4) ,4) ,4,6) +(((((echo(((transpose(echo((X+transpose(X,7) ) ,4,6) ,-7) +transpose((X+X) ,7) ) |step((echo(X,4,6) +transpose(X,-5) ) ,12) ) ,4,6) +transpose(arpeggio((((X+X) +transpose((X+transpose(X,12) ) ,12) ) +transpose((((X+transpose(X,12) ) +X) +(transpose(X,4) |((X+transpose(X,4) ) +transpose(X,7) ) ) ) ,12) ) ) ,4) ) +transpose(transpose((X|(((X|X) +transpose(echo(transpose(X,-5) ,4,6) ,4) ) +transpose(echo(X,4,6) ,7) ) ) ,4) ,7) ) +transpose((shuffle(transpose((shuffle(X) +transpose((X+transpose(X,12) ) ,7) ) ,-5) ) +transpose(transpose(((transpose(transpose(X,4) ,4) +transpose(transpose(X,-7) ,7) ) +transpose(transpose((((X+transpose((X|X) ,12) ) +transpose((X|X) ,-5) ) +transpose(echo(transpose(X,-5) ,4,6) ,7) ) ,-5) ,7) ) ,-5) ,7) ) ,4) ) +transpose(((transpose(X,-5) +transpose((X+transpose(X,12) ) ,12) ) +((transpose(transpose(X,-7) ,-5) +transpose(((echo(X,4,6) +transpose((X+transpose(X,12) ) ,7) ) |(X+(X+transpose(X,7) ) ) ) ,7) ) +transpose((arpeggio(transpose(transpose(X,4) ,-7) ) +transpose((((X+X) +transpose((((X+transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) +step((X+transpose(X,7) ) ,12) ) ,4) ) +transpose(arpeggio(X) ,7) ) ,7) ) ,7) ) ) ,7) ) +transpose(step(transpose((((echo((X|X) ,4,6) |((X+X) |(X+X) ) ) +transpose(((((X+transpose((X|X) ,7) ) +transpose(transpose(X,-5) ,12) ) +transpose(echo(transpose(transpose(X,4) ,4) ,4,6) ,4) ) +transpose((transpose(X,-7) |X) ,7) ) ,4) ) +transpose(((transpose(echo(X,4,6) ,-5) +transpose(transpose((X+transpose(X,12) ) ,-5) ,12) ) +transpose((X+transpose(X,-5) ) ,7) ) ,7) ) ,4) ,12) ,7) ) ) ,-7) ) ,-5) ,4) ,7) ) ,4) ) +transpose(arpeggio(((echo(transpose(((echo(shuffle(((X+transpose(X,12) ) +transpose(X,7) ) ) ,4,6) +shuffle(transpose((transpose(arpeggio(X) ,4) +(((step(X,12) +X) +transpose(transpose(X,-5) ,4) ) +transpose(X,7) ) ) ,-5) ) ) +transpose(((transpose((((X+X) +transpose(transpose(X,-7) ,7) ) +echo(X,4,6) ) ,-5) +((step(((((echo((X+transpose(X,12) ) ,4,6) +transpose((((X|X) +transpose(transpose(X,-7) ,4) ) +transpose(X,7) ) ,7) ) +transpose(((X+transpose(X,7) ) +transpose(arpeggio(X) ,12) ) ,12) ) +transpose((((X|X) +transpose((X|X) ,12) ) +transpose(((X+transpose(X,12) ) +X) ,7) ) ,4) ) +transpose(((transpose(X,-5) +(X+X) ) +step((X+X) ,12) ) ,7) ) ,12) +arpeggio(transpose(X,-5) ) ) +transpose(transpose((echo(transpose((X|X) ,-7) ,4,6) +transpose((X|(X+X) ) ,7) ) ,-5) ,7) ) ) +(((((X|X) +transpose(shuffle(X) ,12) ) +transpose(X,12) ) +(((X+X) +X) |transpose(shuffle(transpose(X,-7) ) ,4) ) ) +transpose(((transpose(transpose(step(transpose(X,4) ,12) ,-5) ,4) +transpose(transpose(transpose((X|(X+transpose(X,4) ) ) ,-5) ,4) ,4) ) +transpose(step((transpose(transpose(X,4) ,-5) +(((X+transpose(X,4) ) +transpose(X,7) ) |shuffle(X) ) ) ,12) ,7) ) ,-5) ) ) ,7) ) ,-7) ,4,6) +transpose(transpose(transpose((step(transpose((((step(transpose(X,-7) ,12) +((shuffle(X) +transpose(X,4) ) +transpose(X,7) ) ) +(((X+transpose(X,4) ) +transpose(X,7) ) +transpose(X,12) ) ) |shuffle(transpose(X,4) ) ) ,-7) ,12) |transpose((transpose(transpose((transpose(shuffle(transpose(echo(X,4,6) ,-5) ) ,-7) +shuffle(((X+transpose(X,4) ) +transpose((X+X) ,7) ) ) ) ,-7) ,-5) +(((shuffle(X) |(transpose(X,4) +step(((X+transpose(shuffle(X) ,4) ) +transpose(X,7) ) ,12) ) ) +transpose(((echo(X,4,6) |X) +transpose(transpose(transpose(X,-7) ,-5) ,7) ) ,4) ) +transpose(transpose((transpose((X+transpose(transpose(X,-7) ,12) ) ,4) |transpose(X,4) ) ,-7) ,7) ) ) ,4) ) ,4) ,-5) ,12) ) +transpose((step(transpose((((((transpose(((X|X) +transpose((X|X) ,12) ) ,4) +echo((echo(transpose(X,4) ,4,6) |step(shuffle(X) ,12) ) ,4,6) ) +transpose(echo((echo(X,4,6) +transpose(step(arpeggio(step((X+transpose(X,12) ) ,12) ) ,12) ,7) ) ,4,6) ,7) ) |((transpose(transpose((X+step(X,12) ) ,4) ,-5) +transpose(echo((((X|X) +shuffle(X) ) |(X|X) ) ,4,6) ,7) ) +transpose((transpose(X,-7) +(transpose(X,-7) +transpose(arpeggio(X) ,12) ) ) ,12) ) ) +transpose(transpose(((arpeggio(step(((X+transpose(X,4) ) +transpose(echo(X,4,6) ,7) ) ,12) ) |((X+transpose(X,12) ) +transpose(transpose(X,-5) ,7) ) ) |(shuffle((transpose(transpose(X,-7) ,-7) +transpose(shuffle(X) ,12) ) ) +transpose(transpose(transpose(transpose(transpose(X,-7) ,4) ,-7) ,4) ,12) ) ) ,-7) ,4) ) +transpose(transpose(transpose((step((arpeggio(((X+transpose(X,12) ) |X) ) +transpose(arpeggio(((X+X) +transpose(arpeggio(X) ,7) ) ) ,7) ) ,12) +transpose(transpose(step(shuffle(transpose(transpose(X,-5) ,4) ) ,12) ,4) ,12) ) ,4) ,-5) ,7) ) ,-7) ,12) +transpose(((shuffle(transpose((transpose((((X+transpose(X,7) ) +transpose((X+transpose(X,7) ) ,4) ) +transpose((X|X) ,7) ) ,-7) +(((X+transpose(X,4) ) +transpose(X,7) ) |X) ) ,-7) ) +transpose((((shuffle(X) +(X+X) ) |((X+transpose(X,7) ) +transpose(step(X,12) ,7) ) ) |(echo((X+transpose(X,12) ) ,4,6) +transpose(echo(X,4,6) ,12) ) ) ,7) ) +echo(transpose(((step(X,12) +transpose(transpose(X,-7) ,4) ) +transpose(transpose(X,-7) ,7) ) ,4) ,4,6) ) ,7) ) ,4) ) ) ,7) )
random seed used was 245709092

The algorithm for Expresso is written in KeyKit, and here's the source code.